Has anyone tested the efficiency? like repeatedly recharge the same battery than do the math? because if this is even close to 75% im in for 2!
11074
The power bank is good. Works perfectly. Fully and easily charges from AC power, and the charge lasts for weeks while still regularly charging your phone/camera batteries.The time it takes the power bank to charge my phone battery is the same time with AC power (I mean normal power from the wall unit). I've used the power bank since November 2013. I bought it because I was traveling abroad to a remote community without electricity to charge my gadgets. Even back in the US, I'm still using it especially outdoors because my phone battery runs down very fast. So over to you
769076
I charged mine all night and it worked charging my phone for like 30 minutes.. what a waste. Took me from like 2% to 30%.
323059
Not sure how much time you'd be spending actively using it vs just having it ready to be used, but I am charging it every other day. I do find that it seems to take longer than other devices to re charge fully. And the cord is oddly short! I received a pop up Msg that encouraged me to close unused apps to preserve battery life. By long pressing the center button open apps appear and they swipe away to close.
1771882
we were able charge it to 100% and use it for 1 or 2 days. We used the phone only for 2 months till we could upgrade to new phone. Phone did got reset one or two times, which use to happen very often on an hourly basis before changing to this battery. My take is there is no perfect battery unless you send it to apple. For this price it is worth the gamble.
130804
I was able to fully charge my android smart phone twice and my itouch ipod twice. I purposly ran both devices down to about 10% charge left. I was curious myself how many charges i could get out of the little battery. The external battery still showed 1 bar left out of 4 bars so i might have been able to get a 5th charge out of it. hope this helps. I bought one for my wife and she loves it as well. We go tent camping alot so it comes in handy for sure.
2061138
I don't know what these guys are talking about it only lasting 8 or 12 hours between charges. What are they doing with it? I work on my computer 8 hours a day and have to recharge the battery every few months or so. What am I missing?
836161
Hey man. Well I use my phone allot. Standard battery was at 15 % or less by the end of the day (unplugging the phone from charging cable at 5:30 am getting home from work at 9 pm) the new battery leaves me with 49% in the same time span. So I would say it gives me an extra 5 hours about. Depending on what you have running ( gps, wifi, 4G, blue tooth, auto rotation and the other sensors. ) if you use your phone allot in a day I would recommend buying one. It really does help. Charging time with Samsung 2 amp charger is about 15 min longer than standard battery. Hope this helps make your decision. Grtz Hey man. Well I use my phone allot. Standard battery was at 15 % or less by the end of the day (unplugging the phone from charging cable at 5:30 am getting home from work at 9 pm) the new battery leaves me with 49% in the same time span. So I would say it gives me an extra 5 hours about. Depending on what you have running ( gps, wifi, 4G, blue tooth, auto rotation and the other sensors. ) if you use your phone allot in a day I would recommend buying one. It really does help. Charging time with Samsung 2 amp charger is about 15 min longer than standard battery. Hope this helps make your... » Read More Hey man. Well I use my phone allot. Standard battery was at 15 % or less by the end of the day (unplugging the phone from charging cable at 5:30 am getting home from work at 9 pm) the new battery leaves me with 49% in the same time span. So I would say it gives me an extra 5 hours about. Depending on what you have running ( gps, wifi, 4G, blue tooth, auto rotation and the other sensors. ) if you use your phone allot in a day I would recommend buying one. It really does help. Charging time with Samsung 2 amp charger is about 15 min longer than standard battery. Hope this helps make your decision. Grtz « Show Less
2076662
Voltage is the same.. mAh rating is overstated. It doesn't last as long a genuine battery but for the price I suppose I will live with it. Probably 20% less run time. Also energy retention isn't as long.
1303210
I am even wondering: was this mess with the batteries intended to attract customers anxious to receive "unadvertised" bigger batteries just to boost initial sales? I am sorry for those who are now starting to receive the "standard" 4400 mAh battery. But I want to comfort you: even while I have the bigger 5800 mAh one, it seems almost impossible to me to drain even 60% of it in a real life student usage. I never carry an ac adapter with me anymore because I consistently get at least 5 min. per every 1% of battery power I have, with wifi turned on and on 60% of brightness. When wifi is occasionally off, it comes up to more than 6 min. per 1%. So, even if you will get 75% of this, it will still carry you through the whole day of classes and an evening in a starbucks. Anyways, I would not trade acer for asus even if I got smaller battery, because acer has unparalleled screen in terms of clarity and brightness.
842412
It is definitely not 7,5 hours. 3 to 4 hours, I would guess. I used it more than 3 hours yesterday, but I think that you will not get 4 on that battery, even if power management is set to reduce maximum. After a year, I expect 3.Right now it says 1:56 (46%) remaining. Indicating +4 hours totally.Cheers
1805616
Not that I have noticed. And the charge rate is so slow that I'm not concerned about overcharging! Hope this helps!
1627868
You can fully charge iphone twice, the third time can't be filled with. For most of the mobile power supply, the actual conversion efficiency is about 2/3 (60% ~ 70%)
1311792
each battery has efficiency in both storing and output. in a year. its safe to say that the battery lost bout 25% of the charged volume.
406177
Its working fine with mine. Note charge fir 12hrs first time then drain to 20%Then recharge as normal , takes 4 charges before get full advantage of larger capacity
1787889
I got like 300 pictures and 5 minutes of video on the alkaline batteries that came with my camera. ... My rechargeable Energizer 2300mAh nimh batteries seemed to be doing about the same. (surprisingly ... I usually get better performance out of the rechargeable, but I may have been using an old / worn out set)
785695
My experience is that it works, but for some reason (no idea myself) it is not communicating properly with the Mac's power management tools. I did a battery calibration (as recommended by Apple - basically a full charge, then run on battery until the computer dies for lack of power, then full charge - but Apple has VERY specfic procedures so search their support site) but that didn't change the message - atleast not immediately. After a week or so, ( about 3 charge cycles ) the message was gone, but then came back after it died after running from the battery for a few hours, and is now gone again on mine. I've been using it for 3 weeks or so I guess. I think the battery calibration process should have made this go away after 2 charge cycles - but it didn't for me. And the calibration process has not properly enabled the hibernation to disk the macbook is supposed to do when the battery gets very low - but the estimated run time is only 15 - 30 minute more than I get. For me, it was not a significant drawback of this cheap clone battery - but I am pretty cheap :) I would be raising a fit at the apple store if a $120 battery from them behaved like this.
1809099
I have experienced in the two that I purchased that one unit literally drains the battery within a two day period. The other unit averages a week of fairly constant use.